Adjustable centering feet assembly for eddy current probe
A centering assembly for an eddy current probe includes a foot element having a plurality of resilient cantilevered legs projecting radially about a central aperture and an adjustment element moveable relative to the foot element for exerting a radial force on the plurality of resilient cantilevered legs. Movement of the adjustment element allows an outside diameter of the plurality of resilient cantilevered legs to be maintained consistent as the plurality of resilient cantilevered legs are worn down during use.
1 . A centering assembly for an eddy current probe, comprising:
a foot element having a plurality of resilient cantilevered legs projecting radially about a central aperture; and
an adjustment element moveable relative to the foot element for exerting a radial force on the plurality of resilient cantilevered legs,
wherein the adjustment element comprises:
a foot expander positioned within the central aperture of the foot element, and
an adjustment nut, movement of which causes the foot expander to exert the radial force on the plurality of resilient cantilevered legs,
wherein movement of the adjustment element allows an outside diameter of the plurality of resilient cantilevered legs to be maintained consistent as the plurality of resilient cantilevered legs are worn down during use.
2 . The centering assembly of claim 1 , wherein the foot element comprises a tubular or frustoconical base and wherein the plurality of resilient cantilevered legs project radially and distally outwardly from the tubular or frustoconical base.
3 . The centering assembly of claim 2 , wherein the plurality of resilient cantilevered legs are circumferentially spaced from each other.
4 . The centering assembly of claim 2 , wherein the plurality of resilient cantilevered legs comprise seven circumferentially spaced resilient cantilevered legs.
5 . The centering assembly of claim 1 , wherein each of the plurality of cantilevered legs comprises a centering foot that includes a curvilinear outer surface configured to engage an interior surface of a conduit under test.
6 . The centering assembly of claim 1 , wherein the foot expander comprises:
a tubular body configured to be received within the foot element and aligned with the central aperture of the foot element; and
a flange portion projecting radially outwardly from a forward portion of the tubular body,
wherein the flange portion is configured to engage portions of the plurality of resilient cantilevered legs.
7 . The centering assembly of claim 6 , further comprising:
an expander shaft, comprising:
a tubular body configured to be received within and secured to the tubular body of the foot expander; and
a threaded portion provided at a forward end of the expander shaft,
wherein the threaded portion extends through the central aperture of the foot element and threadingly engages the adjustment nut to retain the foot element between the flange portion and the adjustment nut.
8 . The centering assembly of claim 7 , wherein an inside surface of the plurality of resilient cantilevered legs comprise an outwardly angled configuration, such that forward movement of the flange portion of the foot expander against the inside surface of the plurality of resilient cantilevered legs causes the centering feet to move radially outwardly and rearward movement of the flange portion of the foot expander against the inside surface of the plurality of resilient cantilevered legs allows the centering feet to move radially inwardly.
9 . The centering assembly of claim 7 , wherein the tubular body of the expander shaft includes an inside diameter configured to receive a portion of the eddy current probe therein.
10 . The centering assembly of claim 1 , wherein the adjustment nut comprises an outer engagement surface.
11 . A centering assembly for an eddy current probe, comprising:
a foot element having a plurality of resilient cantilevered legs projecting radially about a central aperture; and
an adjustment element moveable relative to the foot element for exerting a radial force on the plurality of resilient cantilevered legs,
wherein the adjustment element comprises:
an adjustment nut having a leg deflecting portion projecting rearwardly therefrom,
wherein movement of the adjustment nut causes the leg deflecting portion to exert the radial force on the plurality of resilient cantilevered legs,
wherein movement of the adjustment element allows an outside diameter of the plurality of resilient cantilevered legs to be maintained consistent as the plurality of resilient cantilevered legs are worn down during use.
12 . The centering assembly of claim 11 , wherein the adjustment element further comprises:
an adjustment shaft having a tubular body configured to be received within the central aperture of the foot element,
wherein the adjustment shaft includes a threaded forward end having an outside diameter greater than an inside diameter of the central aperture of the foot element,
wherein the threaded forward end is configured to engage corresponding threads on the adjustment nut.
13 . The centering assembly of claim 12 , wherein the threaded forward end of the adjustment shaft comprises external threads and wherein the threads on the adjustment nut comprise internal threads.
14 . The centering assembly of claim 13 , wherein the adjustment nut further comprises an outer engagement surface.
15 . The centering assembly of claim 12 , wherein the adjustment element further comprises:
a tubular locking collar configured to receive and couple to the tubular body of the adjustment shaft within the foot element,
wherein an outside diameter of the tubular locking collar is greater than the inside diameter of the central aperture of the foot element, and
wherein a length of the tubular locking collar is configured such that the tubular a forward end of the tubular locking collar engages an inside surface of the foot element adjacent the central aperture to secure foot element to the adjustment shaft.
16 . The centering assembly of claim 12 , wherein the tubular body of the adjustment shaft includes an inside diameter configured to receive a portion of the eddy current probe therein.
17 . A non-destructive conduit testing assembly, comprising:
an eddy current probe; and
two or more centering assemblies coupled to the eddy current probe and configured to maintain the eddy current probe in a position centered within a conduit under test,
wherein each of the two or more centering assemblies comprises:
a foot element having a plurality of resilient cantilevered legs projecting radially and rearwardly about a central aperture;
a foot expander positioned within the central aperture of the foot element for exerting a radial force on the plurality of resilient cantilevered legs; and
an adjustment nut threadingly coupled to the foot expander,
wherein movement of the adjustment nut causes the foot expander to exert the radial force on the plurality of resilient cantilevered legs.
18 . The non-destructive conduit testing assembly of claim 17 , wherein the foot expander comprises:
a tubular body configured to be received within the foot element and aligned with the central aperture of the foot element; and
a flange portion projecting radially outwardly from a forward portion of the tubular body,
wherein the flange portion is configured to engage portions of the plurality of resilient cantilevered legs.
19 . A non-destructive conduit testing assembly, comprising:
an eddy current probe; and
two or more centering assemblies coupled to the eddy current probe and configured to maintain the eddy current probe in a position centered within a conduit under test,
wherein each of the two or more centering assemblies comprises:
a foot element having a plurality of resilient cantilevered legs projecting radially and rearwardly about a central aperture;
an adjustment shaft having a tubular body configured to be received within the central aperture of the foot element; and
an adjustment nut threadingly coupled to the adjustment shaft,
wherein the adjustment shaft includes a threaded forward end having an outside diameter greater than an inside diameter of the central aperture of the foot element,
wherein the threaded forward end is configured to engage corresponding threads on the adjustment nut,
wherein the adjustment nut includes a leg deflecting portion projecting rearwardly therefrom,
wherein movement of the adjustment nut causes the leg deflecting portion to exert a radial force on the plurality of cantilevered legs.